<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        nav {
            height: 200px;
            background-color: red;
            display: block;
        }

        div {
            height: 200px;
            background-color: blue;
        }
    </style>
    <!-- if lt IE 9：低于`IE9`版本会加载 -->
    <!--[if lt IE 9]>
        <script type="text/javascript" src="../js/html5shiv.min.js"></script>
    <![endif]-->
</head>

<body>
    <nav>语义标签的导航</nav>
    <div>没有语义的导航</div>
</body>

</html>